package com.zerosky.crm.util;

import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.alibaba.fastjson.JSONObject;
import com.zerosky.crm.po.AccessToken;


public class WeChatUtils {
	private static String token = "weixinCourse";

	private static String appid = "wx0d5a21239b276648";
	private static String REDIRECT_URI = "zhineng.mofasuidao.cc";
	private static String secre = "BbGz09ggaBfqhGtyAS22UPaXHoX0msL4FUkNbH1426U";
	private static String ACCESS_TOKEN_URL = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=APPID&corpsecret=SECRECT";
	
	/**
	 * 验证签名
	 * 
	 * @return
	 */
	public static boolean checkSignature(String signature, String timestamp,
			String nonce) {
		String[] arr = new String[] { token, timestamp, nonce };
		// 将token、timestamp、nonce三个参数进行字典序排序
		Arrays.sort(arr);
		StringBuilder content = new StringBuilder();
		for (int i = 0; i < arr.length; i++) {
			content.append(arr[i]);
		}
		MessageDigest md = null;
		String tmpStr = null;

		try {
			md = MessageDigest.getInstance("SHA-1");
			// 将三个参数字符串拼接成一个字符串进行sha1加密
			byte[] digest = md.digest(content.toString().getBytes());
			tmpStr = byteToStr(digest);
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}

		content = null;
		// 将sha1加密后的字符串可与signature对比，标识该请求来源于微信
		return tmpStr != null ? tmpStr.equals(signature.toUpperCase()) : false;
	}

	/**
	 * 将字节数组转换为十六进制字符串
	 * 
	 * @param byteArray
	 * @return
	 */
	private static String byteToStr(byte[] byteArray) {
		String strDigest = "";
		for (int i = 0; i < byteArray.length; i++) {
			strDigest += byteToHexStr(byteArray[i]);
		}
		return strDigest;
	}

	/**
	 * 将字节转换为十六进制字符串
	 * 
	 * @param mByte
	 * @return
	 */
	private static String byteToHexStr(byte mByte) {
		char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',
				'B', 'C', 'D', 'E', 'F' };
		char[] tempArr = new char[2];
		tempArr[0] = Digit[(mByte >>> 4) & 0X0F];
		tempArr[1] = Digit[mByte & 0X0F];

		String s = new String(tempArr);
		return s;
	}

	/**
	 * 给网址发送请求
	 * 
	 * @param url
	 */
	public static String sendPost(String url) {
		HttpRequest hr = new HttpRequest();
		return hr.sendPost(url, "");
	}


	
	/**
	 * 获取当前时间戳(秒)
	 * @return String
	 */
    public static String create_timestamp() {
        return Long.toString(System.currentTimeMillis() / 1000);
    }
    
    
    public static AccessToken getAccessToken() throws IOException{
        AccessToken token = new AccessToken();
        String url = ACCESS_TOKEN_URL.replace("APPID", appid).replace("SECRECT", secre);
        JSONObject jsonObject = JSONObject.parseObject(sendPost(url));
        if(jsonObject!=null){
            token.setToken(jsonObject.getString("access_token"));
            token.setExpiresIn(jsonObject.getInteger("expires_in"));
        }
        return token;
    }
    
    

    
    
    
}
